<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			div{
				display: inline-block;
			}
			#aa{
				border: #000000 1px solid;
				width: 240px;
				height: 200px;
				background-image: url(../day3.2/img/cam.png);
			}
			#aa:hover{
				background-image: url(../day3.2/img/cam.png);
				background-position: 0 -240px;
			}
			#bb{
				border: #000000 1px solid;
				width: 240px;
				height: 200px;
				background-image: url(../day3.2/img/cam.png);
				background-position: 0 -480px;
			}
			#bb:hover{
				background-image: url(../day3.2/img/cam.png);
				background-position: 0 -720px;
			}
		</style>
	</head>
	<body>
		<div id="aa">
			
		</div>
		<div id="bb">
			
		</div>
	</body>
</html>
